. >>> we're going to turn now to the latest on the health scare for vice president joe biden's son, beau. he is said to be in great shape and expected to be discharged today from a houston cancer hospital, after undergoing a procedure there earlier this week. doctors don't know yet what's exactly wrong with beau biden. but he was admitted after becoming weak and disoriented last week. abc's chief medical editor, dr. richard besser, here with us this morning. and rich, make it clear. you haven't seen the records here. you don't know exactly what is wrong. but first, treated for a stroke. and now, at a cancer center. what does it say to you? >> initially, when you hear someone has symptoms that are like a stroke and they've had a stroke in the past, you have to think that whatever was going on before, it's happening now. but md anderson cancer center, it's one of the best in the world. it makes you think that this has to be related in some way to some type of a cancer. >> could certain cancers cause a stroke? >> well, if you have anything growing in your head, whether it's benign or cancer